NEW YORK, Feb 20 (Reuters) - U.S. stock index futures fell
on Thursday, pressured by weak results from Wal-Mart as well as
global geopolitical and economic uncertainty that gave investors
few reasons to buy despite a sharp selloff in the previous
session.

* Some of Wall Street's biggest trading favorites will be in
focus on Thursday, with Facebook Inc announcing a massive
acquisition and Tesla Motors giving a strong earnings
outlook.

* Turmoil in emerging markets continued, with Ukraine
experiencing some of its worst violence since the end of the
Cold War. The country's hryvnia currency dropped to near
five-year lows, while the country's state debt insurance costs
rose to their highest since December 2009.

* Emerging market growth was also in view after China's
flash Markit/HSBC Purchasing Managers' Index fell to a
seven-month low in February, falling under the level that
represents expansion.
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